DIVERSE COMPONENTS 



353 



arterial pressure has a turnover, being gained and lost during each 

 heart beat. Superimposed upon that exchange of pressure is the 

 rate at which the pressure (systolic, diastolic, mean) increases or 

 decreases while recovering from each increment above or below the 

 usual. 



+600 



-^700 



■^600 



+ 500 



S+400 

 o 



Q) 



^+3001- 



■o 

 o 

 o 



-J+zoo- 



-100 



Diastolic pr. 







Q033 '0.066 0.099 QI32 0.165 



Hours 

 Pig. 176. Loads of various components during physical exercise and recovery, in 

 relation to time. Man. One individual working on a stationary bicycle at the rate of 

 46,000 kg.m./hour. Eecovery began at 0.083 hour. In the five quantities measured, 

 each load is expressed in per cent of the value in the fore-period or control state. The 

 systolic and diastolic pressures were estimated in the brachial artery. The "cardiac 

 output" was inferred from the rate of uptake of nitrous oxide in the lungs. Data of 

 Iljin-Kakujeff ('36). 



§ 126. Volume flow of blood 



A flow may be equilibrated in the same fashion as a pressure or 

 a frequency or a chemical entity. For the circulation as a whole, 

 presumed '' cardiac output" (rate of volume flow of blood) may be 

 measured by any of the approximate methods. By a nitrous oxide 

 method in man (rate of absorption of NoO in the lungs), the recov- 



